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(1) Jane is in 3 class. She is pretty. She has 2 brothers.
(2) Kate is in 2 class. She sings and dances well.
(3) Tom is very tall. He studies in 1 class. He want to be a scientist.
(4) Robert is in 3 class. He study hard. He knows nothing but study.
(5) 1 class is Mary's class. the morals of the class is high.

Every value in "name_class_blah_blah" field surely has the word "class" and a numeric value before the word "class".

Actually there is surely a space bar between the numeric value and the word "class".

So the actual group keys are 1 class, 2 class, and 3 class.

Originally Posted by r937

what does "in the middle" mean?

It means the group key comes inside(in the middle) of the paragraph which is the value of the "name_class_blah_blah" field